Torts — Premises liability — Duty to maintain — Action against landlords for injuries suffered by plaintiff as a result of tripping over a cracked pathway that both landlord and plaintiff had been aware of for over ten years — Open and obvious danger — Trial court correctly entered summary judgment in favor of landlords as to duty to warn — Trial court erred in granting summary judgment on the issue of failure to maintain where, although plaintiff continued to use the cracked pathway despite her awareness of its condition, plaintiff’s knowledge of the condition of the pathway merely raised an issue of fact as to her own comparative negligence